I'm not trying to knock that story, or turbo Regals, but that guy has more than a test pipe and 22 psi. To run mid 12s on regular tires that thing must have more done to it. Don't get me wrong, I'm the biggest fan of turbo Regals there is, but I see an adj. regulator, larger necks on the intercooler, and there's probably a few things you can't see from the small pic. I got that issue right in front of me and can see all that stuff clearly. I'll say one thing though, that's a sneaky ole man. Nice car too! As for the subject of this thread, it all depends on the driver and weather and tune and traction.... catch my drift? I've seen stock GN times in the high 4s yet a stock GNX has an advertised time of 5.5. I know the GNX has more power and some would say would result in slower times due to that, but it also had wider tires and a better suspension for traction.